Passive skills

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  UndeadTakes 10% increased damage from attacks that are effective against Undead. HP Recovery +10% Received P. Crit. Rate -5% Received P. Crit. Damage -5% Received M. Crit. Damage -5% Vampiric Rage effect +1% Skills Vampiric effect +3% Resistance to Bleed +20% Resistance to Holy -10%
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  Slightly Strong P. Atk.P. Atk. +15%.
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  Slightly Strong M. Atk.M. Atk. +25%.
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  Slightly Weak P. Def.P. Def. -10%.
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  Very Strong M. Def.M. Def. +70%.
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  Holy VulnerabilityVulnerable to Divinity attack.
• 
  Dark AttackUnleashes a dark attack.
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  Bow/Crossbow ResistanceResistant to Bow/Crossbow attacks.
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  Bleed ResistanceResistant to Bleed.

Where it stands

4 spawn points from the wiki · 22 more likely ones, paler and visible when you zoom in.

What it costs and whether farming it pays — in the service: prices are read from the live order book, separately for every server.